Electrical signals derived from optical sources have achieved record‐low levels of phase
noise, and have demonstrated the highest frequency stability yet achieved in the microwave …

High-repetition-rate (up to GHz) femtosecond mode-locked lasers have attracted significant
attention in many applications, such as broadband spectroscopy, high-speed optical …

Coherent frequency division of high-stability optical sources permits the extraction of
microwave signals with ultra-low phase noise, enabling their application to systems with …

Low noise and high repetition rate optical frequency combs are desirable for many
applications, from timekee** to precision spectroscopy. For example, gigahertz repetition …

We report on the first deployment of a ytterbium (Yb) transportable optical lattice clock
(TOLC), commercially ship** the clock 3000 km from Boulder, Colorado, to Washington …

Progress made in optical references, including ultrastable Fabry–Perot cavities, optical
frequency combs, and optical atomic clocks, has driven the need for ultrastable optical fiber …

We show that state-of-the-art phase noise and high frequency stability could be
simultaneously achieved in a microwave oscillator based on the sapphire-loaded cavity …

The generation and transfer of ultra-stable microwave signals are of paramount importance
in numerous applications spanning from radar systems to communications and metrology …

We show that fast technical fluctuations of microwave signals can be strongly suppressed by
cryogenic resonators. The experiments were carried out with sapphire resonators cooled to …

Due to their low phase noise at high carrier frequencies, photonic microwave oscillators are
continuously expanding their application areas including digital signal processing …